You can create a mosaic out of your own images that can be uploaded (or) by using images from Pixsnaps default set of images put into different categories like Nature,Buildings,Animals,People,Food,Flower,Abstract,Summer, Kids, Assorted ( OR ) by using images from your flickr account.

Select how light or how dark your mosaic will look

and you have your output which can set as a desktop wallpaper or saved as a background in your MySpace Profile.